diff --git a/src/diff/base.js b/src/diff/base.js
index bac0dbfe..8d8e14c2 100644
--- a/src/diff/base.js
+++ b/src/diff/base.js
@@ -1,6 +1,4 @@
-export default function Diff(ignoreWhitespace) {
-  this.ignoreWhitespace = ignoreWhitespace;
-}
+export default function Diff() {}
 
 Diff.prototype = {
   diff(oldString, newString, callback) {
@@ -139,8 +137,7 @@ Diff.prototype = {
   },
 
   equals(left, right) {
-    let reWhitespace = /\S/;
-    return left === right || (this.ignoreWhitespace && !reWhitespace.test(left) && !reWhitespace.test(right));
+    return left === right;
   },
   removeEmpty(array) {
     let ret = [];
diff --git a/src/diff/word.js b/src/diff/word.js
index 868a73de..10d6a008 100644
--- a/src/diff/word.js
+++ b/src/diff/word.js
@@ -20,7 +20,13 @@ import Diff from './base';
 // Latin Extended Additional, 1E00–1EFF
 const extendedWordChars = /^[a-zA-Z\u{C0}-\u{FF}\u{D8}-\u{F6}\u{F8}-\u{2C6}\u{2C8}-\u{2D7}\u{2DE}-\u{2FF}\u{1E00}-\u{1EFF}]+$/u;
 
-export const wordDiff = new Diff(true);
+const reWhitespace = /\S/;
+
+export const wordDiff = new Diff();
+wordDiff.equals = function(left, right) {
+  return left === right || (!reWhitespace.test(left) && !reWhitespace.test(right));
+};
+
 export const wordWithSpaceDiff = new Diff();
 wordDiff.tokenize = wordWithSpaceDiff.tokenize = function(value) {
   let tokens = value.split(/(\s+|\b)/);